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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a3dde127822cad1d995e794bd85310f87ae648e377d71d4808319a35d09e16' 
  AND token = '8pH+Yexv+21CJLslAdTk1+gmA2shyjTuXV4OU+bW6AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}